8743921 has 6 divisors (see below), whose sum is σ = 8953890. Its totient is φ = 8538768.

The previous prime is 8743919. The next prime is 8743937. The reversal of 8743921 is 1293478.

It can be written as a sum of positive squares in only one way, i.e., 4999696 + 3744225 = 2236^2 + 1935^2 .

It is not a de Polignac number, because 8743921 - 2¹ = 8743919 is a prime.

8743921 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (8743901) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 516 + ... + 4213.

It is an arithmetic number, because the mean of its divisors is an integer number (1492315).

Almost surely, 2^8743921 is an apocalyptic number.

It is an amenable number.

8743921 is a deficient number, since it is larger than the sum of its proper divisors (209969).

8743921 is an equidigital number, since it uses as much as digits as its factorization.

8743921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4815 (or 4772 counting only the distinct ones).

The product of its digits is 12096, while the sum is 34.

The square root of 8743921 is about 2957.0121744761. The cubic root of 8743921 is about 206.0165333762.

The spelling of 8743921 in words is "eight million, seven hundred forty-three thousand, nine hundred twenty-one".